Java使用dom4j修改xml内容

喜欢ヅ旅行 2022-10-06 06:49 202阅读 0赞

使用dom4j修改xml内容是很方便的，有很多API方法，可以参考官网：[https://dom4j.github.io/\#top][https_dom4j.github.io_top]

##### 1,引入Maven依赖 #####

<dependency>
      <groupId>org.dom4j</groupId>
      <artifactId>dom4j</artifactId>
      <version>2.1.1</version>
    </dependency>
    
    <dependency>
      <groupId>jaxen</groupId>
      <artifactId>jaxen</artifactId>
      <version>1.2.0</version>
    </dependency>

##### 2.Xml内容如下 #####

<?xml version="1.0" encoding="UTF-8"?>
    <ProductMeta>
      <TaskId>task111</TaskId>
      <ProductID>XPS_20210429000010_665_102</ProductID>
      <ErrorInfos>0.2</ErrorInfos>
      <CloudeCover>0.3</CloudeCover>
      <Path>665</Path>
      <Row>102</Row>
      <ProductInfo>
        <TaskType>task1</TaskType>
        <ProductType>XPS_Red</ProductType>
      </ProductInfo>
    </ProductMeta>

##### 3.后台根据传递的参数和值修改xml内容 #####

参数为Xml的字段名

public static void main(String[] args) {
           // 1.前端传递的参数和值
    		Map<String, Object> codeVaules = new HashMap<>();
    		codeVaules.put("ProductMeta.Path" , "665");
    		codeVaules.put("ProductMeta.Row" , "102");
    		codeVaules.put("ProductMeta.ErrorInfos" , "0.2");
    		codeVaules.put("ProductMeta.CloudeCover" , "0.3");
    		codeVaules.put("ProductMeta.ProductInfo.ProductType" , "XPS_Yellow");
            
            // 2.XML文件路径
            String xmlPath = "C:\\Users\\zhuyu\\Desktop\\20210325\\XPS_20210429000010_665_102.xml";
            try {
                File xmlFile = new File(xmlPath);
                if(!xmlFile.exists()){
                    return;
                }
                // 使用dom4j读取xml
                SAXReader saxReader = new SAXReader();
                Document document = saxReader.read(xmlFile);
                //循环查找xml中的字段，并将值替换进去
                for(Map.Entry<String,Object> map : codeVaules.entrySet()) {
                    //将用户传递的key转换成功xml中的字段，将 逗号 转换为 / 
                    String key = map.getKey().replaceAll("\\." ,"/");
                    Object value = map.getValue();
                    //组装成特定格式，查找field，并设置值
                    //Node node = document.selectSingleNode("//foo/bar/author");
                    Node node = document.selectSingleNode("//" + key);
                    if(node != null){
                       node.setText(String.valueOf(value));
                    }
                }
                //将设置的值写入xml文件
                FileWriter fileWriter = new FileWriter(xmlPath);
                XMLWriter writer = new XMLWriter(fileWriter);
                writer.write(document);
                writer.close();
                fileWriter.close();
            }catch (DocumentException e){
                e.printStackTrace();
            }catch (IOException e){
                e.printStackTrace();
            }
        }

##### 4.dom4j其他API #####

import java.net.URL;
    
    import org.dom4j.Document;
    import org.dom4j.DocumentException;
    import org.dom4j.io.SAXReader;
    
    public class Foo {
    
        public Document parse(URL url) throws DocumentException {
            SAXReader reader = new SAXReader();
            Document document = reader.read(url);
            return document;
        }
        
       public void bar(Document document) throws DocumentException {
          Element root = document.getRootElement();
          // iterate through child elements of root
          for (Iterator<Element> it = root.elementIterator(); it.hasNext();) {
              Element element = it.next();
              // do something
          }
    
          // iterate through child elements of root with element name "foo"
          for (Iterator<Element> it = root.elementIterator("foo"); it.hasNext();) {
              Element foo = it.next();
              // do something
          }
       }
    
      public void bar(Document document) {
          List<Node> list = document.selectNodes("//foo/bar");
          Node node = document.selectSingleNode("//foo/bar/author");
          String name = node.valueOf("@name");
      }
    
      public void treeWalk(Document document) {
          treeWalk(document.getRootElement());
      }
      public void treeWalk(Element element) {
          for (int i = 0, size = element.nodeCount(); i < size; i++) {
              Node node = element.node(i);
              if (node instanceof Element) {
                  treeWalk((Element) node);
              }
              else {
                  // do something…
              }
          }
      }
    }

Create XML

//Create XML
      public Document createDocument() {
            Document document = DocumentHelper.createDocument();
            Element root = document.addElement("root");
    
            Element author1 = root.addElement("author")
                .addAttribute("name", "James")
                .addAttribute("location", "UK")
                .addText("James Strachan");
    
            Element author2 = root.addElement("author")
                .addAttribute("name", "Bob")
                .addAttribute("location", "US")
                .addText("Bob McWhirter");
    
            return document;
        }

Write XML

//Write XML
    
    import org.dom4j.Document;
    import org.dom4j.io.OutputFormat;
    import org.dom4j.io.XMLWriter;
    
    public class Foo {
    
        public void write(Document document) throws IOException {
    
            // lets write to a file
            try (FileWriter fileWriter = new FileWriter("output.xml")) {
                XMLWriter writer = new XMLWriter(fileWriter);
                writer.write( document );
                writer.close();
            }
    
    
            // Pretty print the document to System.out
            OutputFormat format = OutputFormat.createPrettyPrint();
            writer = new XMLWriter(System.out, format);
            writer.write( document );
    
            // Compact format to System.out
            format = OutputFormat.createCompactFormat();
            writer = new XMLWriter(System.out, format);
            writer.write(document);
            writer.close();
        }
    }

[https_dom4j.github.io_top]: https://dom4j.github.io/#top